Process of making alloy steel



ing elements. or materials Patented Ju ly 28, 19 25. i 4

SUNITED" STATES, PATENT on 1,013 .f

ALAN xrssocx, or new YORK, 1w. 2;, Assmnon r0 CARL m." LOEB, or new You,is. Y.

rnocnss or Maxine ALLOY swam..

no Drawing.

To all whom it may concern: I

"Be it known that I, ALAN Kissoox, a citi-' zen of the United States,residing at New The invention relates to a novel processof producingalloy steel, .and in certain 10. aspects thereof it relates'moreparticularly to a'novel process of producing molybdenum alloy steel. IThe process consists in the novel ste s and process hereinafterdescribed; and t e 0b ects and advantages thereof are hereinafterpointed out in part, or will be obvious herefrom or may be ascertainedby practicing the invention. I p The processis directed primarily to thealloying of steelwith a .suitable alloying metal .while obviating thepreliminary .reduction of the alloym metal or metallic compound to themetallic state or condition, and also avoiding the addition ofslag-formof the alloying agent or material-in the: steel furnace.

It is known in the art to make alloy steel,

bly adding to the fused steel inthe furnace is e alloying element afterit has been reduced to the metallic state, which state in the case ofdifferent elements is designated ferrochromium, num, etc. I 86 In thecase of molybdenum, it is further known that this metal may beintroduced directly into the fused steel as an alloy in the form ofcertain salts thereof, without the preliminary reduction into themetallic state 40 in the electric furnace already referred to; that is,in the case of molybdenum, without such preliminary reduction toferrd-molybferro-tungsten,- ferro-molybdedenum. Two instances of.such-salts of.

molybdenum and the direct alloying thereof with the steel are calciummolybdate (as disclosed in my United States Patent No 1,300,279 and ironmolybdate (as-disclosed t1 nited States application Ser. No.

in my 714,769 filed May 21, 1924). I

7 There are many instances, however, in'

. which the use ofa salt, 'or

any chemicall the, -desired a lo jable and-yhdesi the presence of ingelement is objectionble', asforinstance, in the in thereduction verydirect and simple,

It utilizes as the alloying agent combined metal other than Applicationfiled November 12, 1924. Serlalno. 749,581.

' manufacture of certain high-grade steels.

Withthe attainment of this object primarily in view, in accordance withvention, I employ as the alloying agent or substance one of the oxidesof molybdenum,

preferably the tri-oxide, MoO,,.

.- Thesecompounds of molybdenum present. .or exman advantagesforalloying steel. amp e, the tri-oxide may be produced directly andsimply from high-grade molybdenite (MoSg) concentrates by a simpleroasting operation, and without the addition of. any diluting material,such for instance as 'the compounds of iron or calcium.

' The molybdenum oxide may be introduced into the steel furnace by beingadded withthe char e, or may be introduced intohthe furnace s ag duringthe regular steelfmelting and refining process, or at other suitabletime, the molybdenu'm oxide being absorbed into'the slag, and themetallic molybdenum being subsequently redpced therefrom by the contactof the molybdenum bearing slag with lybdenum content of the furnace slagin this mannerenters into and alloys with the steel in any desiredproportion, de endent upon into the furnace.

of the molybdenum oxide.

The process of my 'present invention is and is exceedingly economicaL. amaterial of higher grade and greater purity, which is more entirelysuitable in-the manufacture of better steels, as well as being desirableand advantageousin other connections.

It will be understood that the process is likewise workable with othersubstances manner 0 practicing. the invenlybdenum direct] to the steelfurnace during the rocess 0 making the steel,whereby the oxi my presentin- 1. The process of making molybdenum: steel comprising adding anoxideof moe is reduced by the constituents of 2;

the molten'steel beneath. The metallic mowhich behave in the samegeneral manner I constitute the present the'steel-bath noother'reducingagent being added toefiectthe reduction of themolybdeoxide is reducedeby the steel itself, no other num oxide,reducing agent being added to effect the re- 2. The process of makingmolybdenum duction of the molybdenum oxide. 1

steel com rising adding a. charge consisting In testimony whereof, Ihave signed my solely o substantially pure molybdenum name to thisspecification. oxide directly to the steel furnace during the process ofmaking the steel, whereby the ALAN KISSOCK.

